ALTDEV ON ARR AT YYZ.

Narrative

APCHING CYYZ; ATC ISSUED US ROUTING TO INCLUDE GUELF (FOUND ON RWY 23/24L PROFILE DSCNT). ATC GAVE US AN INITIAL DSCNT TO FL200; THEN CLRED US THE RWY 5/6R PROFILE DSCNT. WE HAD CHANGED CTLRS/FREQS BEFORE THE RWY 5/6R PROFILE DSCNT WAS GIVEN. AS GUELF IS NOT ON THE RWY 5/6R ARR; I TOOK MANUAL CTL OF THE ACFT WHILE WE ASKED THE CTLR FOR VERIFICATION. HE CHANGED OUR ARR ROUTING POINT TO RICKI AND THE RWY 5/6R PROFILE DSCNT. A SHORT TIME LATER; THE CTLR THEN ISSUED US ANOTHER CLRNC TO DSND AND MAINTAIN 7000 FT. THE FO WAS PLACING NEW ROUTING IN THE FMC. I CONTINUED OUR DSCNT WITH SOME TSTMS IN THE AREA ON RADAR. WHILE DSNDING TO 7000 FT; I REALIZED (JUST BEFORE THE 15 DME ARC) THAT SUBSEQUENT ALT CLRNCS GIVEN IN CANADIAN AIRSPACE DO NOT NEGATE OUR REQUIREMENT TO MEET THE ALTS SHOWN ON THE PROFILE DSCNT. AS SOON AS I RECOGNIZED MY ERROR; I LEVELED THE ACFT BTWN 10500-11000 FT; THEN CONTINUED OUR DSCNT TO 7000 FT. (THE 15 DME RESTR IS YWT 15 DME ARC AT OR BTWN 12000-14000 FT). NO CONFLICTS WERE ENCOUNTERED AND NO ADVERSE EFFECTS. I AM A RELATIVELY NEW CAPT; AND NEW TO THIS ACFT. FEEL THAT THE CONFLICT IN CLRNCS GIVEN; AND MY WORKLOAD MGMNT (WATCHING FOR TSTMS; CHKING THE FO'S FMC WORK; AND MANUALLY FLYING THE ACFT) ALONG WITH THE CONFUSION/DIFFERENCE IN UNITED STATES/CANADIAN PROCS CONTRIBUTED TO MY MISSING THE RESTR.